What s the Difference?
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- Clemence Caldwell
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1 What s the Difference? Subtracting Integers Learning Goals In this lesson, you will: Model subtraction of integers using two-color counters. Model subtraction of integers on a number line. Develop a rule for subtracting integers. Key Term zero pair I don t want nothing! We don t need no education. I can t get no satisfaction. You may have heard or even said these phrases before. In proper English writing, however, these kinds of phrases should be avoided because they contain double negatives, which can make your writing confusing. For example, the phrase I don t need none contains two negatives : the word don t and the word none. The sentence should be rewritten as I don t need any. In mathematics, double negatives can be confusing as well, but it s perfectly okay to use them! In this lesson, you will learn about subtracting integers, which sometimes involves double negatives. 4.4 Subtracting Integers 225
2 Problem 1 Temperatures 1. Complete the table to determine the difference between the maximum and minimum temperatures in each row. Subtract the minimum temperature from the maximum temperature, not the other way around. United States Extreme Record Temperatures and Differences State Maximum Temp. ( F) Minimum Temp. ( F) Georgia Hawaii Florida Alaska California North Carolina Arizona Difference ( F) Texas ºF a. Which state shows the least difference between the maximum and minimum temperature? b. Which state shows the greatest difference between the maximum and minimum temperature? 226 Chapter 4 Addition and Subtraction with Rational Numbers
3 2. You overheard a radio announcer report that from 12:00 pm to 3:00 pm the temperature went from 25 F to 210 F. He said, It is getting warmer. Was he correct? Explain your reasoning. Problem 2 Models for Subtracting Integers Subtraction can mean to take away objects from a set. Subtraction can also mean a comparison of two numbers, or the difference between them. The number line model and the two-color counter model used in the addition of integers can also be used to investigate the subtraction of integers. Using just positive or just negative counters, you can show subtraction using the take away model. Example 1: First, start with seven positive counters Then, take away five positive counters Two positive counters remain. Example 2: 27 2 (25) First, start with seven negative counters. Then, take away five negative counters (25) 5 22 Two negative counters remain. 4.4 Subtracting Integers 227
4 1. How are Examples 1 and 2 similar? How are these examples different? To subtract integers using both positive and negative counters, you will need to use zero pairs Recall that the value of a and + pair is zero. So, together they form a zero pair. You can add as many pairs as you need and not change the value. Example 3: (25) Start with seven positive counters The expression says to subtract five negative counters, but there are no negative counters in the first model. Insert five negative counters into the model. So that you don t change the value, you must also insert five positive counters This value is 0. Now, you can subtract, or take away, the five negative counters Take away five negative counters, and 12 positive counters remain (25) Chapter 4 Addition and Subtraction with Rational Numbers
5 Example 4: Start with seven negative counters. 2. The expression says to subtract five positive counters, but there are no positive counters in the first model. a. How can you insert positive counters into the model and not change the value? b. Complete the model. c. Now, subtract, or take away, the five positive counters. Sketch the model to show that This is a little bit like regrouping in subtraction. 4.4 Subtracting Integers 229
6 3. Draw a representation for each subtraction problem. Then, calculate the difference. a. 4 2 (25) b (25) c Chapter 4 Addition and Subtraction with Rational Numbers
7 d How could you model 0 2 (27)? a. Draw a sketch of your model. Finally, determine the difference. b. In part (a), would it matter how many zero pairs you add? Explain your reasoning. 4.4 Subtracting Integers 231
8 5. Does the order in which you subtract two numbers matter? Does have the same answer as 3 2 5? Draw models to explain your reasoning. 6. Write a rule for subtracting positive and negative integers. Problem 3 Subtracting on a Number Line Cara thought of subtraction of integers another way. She said, Subtraction means to back up, or move in the opposite direction. Like in football when a team is penalized or loses yardage, they have to move back. Analyze Cara s examples. Example 1: _ 6 _ (+2) _ 6 opposite of First, I moved from zero to _ 6, and then I went in the opposite direction of the +2 because I am subtracting. So, I went two units to the left and ended up at _ 8. _ 6 _ (+2) = _ Chapter 4 Addition and Subtraction with Rational Numbers
9 Example 2: _ 6 _ ( _ 2) _ 6 opposite of _ In this problem, I went from zero to _ 6. Because I am subtracting ( _ 2), I went in the opposite direction of the _ 2, or right two units, and ended up at _ 4. _ 6 _ ( _ 2) = _ 4 Example 3: 6 _ ( _ 2) 6 opposite of _ Explain the model Cara created in Example 3. Example 4: 6 _ (+2) 6 opposite of Explain the model Cara created in Example Subtracting Integers 233
10 3. Use the number line to complete each number sentence. a (23) 5 Use Cara's examples for help b (24) c d e (23) f g h (24) Chapter 4 Addition and Subtraction with Rational Numbers
11 4. What patterns did you notice when subtracting the integers in Question 3? a. Subtracting two negative integers is similar to b. Subtracting two positive integers is similar to c. Subtracting a positive integer from a negative integer is similar to d. Subtracting a negative integer from a positive integer is similar to 5. Analyze the number sentences shown a. What patterns do you see? What happens as the integer subtracted from 28 decreases? b. From your pattern, predict the answer to 28 2 (21). For a subtraction expression, such as 28 2 (22), Cara s method is to start at zero and go to 28, and then go two spaces in the opposite direction of 22 to get 26. Dava says, I see another pattern. Since subtraction is the inverse of addition, you can think of subtraction as adding the opposite number. That matches with Cara s method of going in the opposite direction (-2) is the same as (2) = -6 opposite of - 2 = - (- 2) Subtracting Integers 235
12 An example of Dava s method is shown (-4) = (-4) = Apply Dava s method to determine each difference. a (22) 5 b (23) 5 c d e f g (230) 5 h So, I can change any subtraction problem to show addition if I take the opposite of the number that follows the subtraction sign. 7. Determine the unknown integer in each number sentence. a b c d e. 2 (25) f g h i Chapter 4 Addition and Subtraction with Rational Numbers
13 8. Determine each absolute value. a (23) b c d. 7 2 (23) 9. How does the absolute value relate to the distance between the two numbers in Question 8, parts (a) through (d)? 10. Is equal to 6 2 8? Is equal to 6 2 4? Explain your thinking. Talk the Talk 1. Tell whether these subtraction sentences are always true, sometimes true, or never true. Give examples to explain your thinking. a. positive 2 positive 5 positive b. negative 2 positive 5 negative c. positive 2 negative 5 negative d. negative 2 negative 5 negative 4.4 Subtracting Integers 237
14 2. If you subtract two negative integers, will the answer be greater than or less than the number you started with? Explain your thinking. 3. What happens when a positive number is subtracted from zero? 4. What happens when a negative number is subtracted from zero? 5. Just by looking at the problem, how do you know if the sum of two integers is positive, negative, or zero? 6. How are addition and subtraction of integers related? Be prepared to share your solutions and methods. 238 Chapter 4 Addition and Subtraction with Rational Numbers
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BOOK 6 ( CBSE ) / Chap 6 / Integers. Chapter Facts : 1. The collection consisting of natural numbers, zero and negatives of natural numbers is called integers [..., 4, 3, 2, 1, 0, 1, 2, 3, 4,... ] 1, 2,
Integers and Rational Numbers
1 Skills Intervention: Integers The opposite, or additive inverse, of a number is the number that is the same distance from zero on a number line as the given number. The integers are the set of whole